package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper  userMapper;
    @Autowired
    private WorkspaceService workspaceService;



    /**
     * 根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        //统计图形本质是一组字符串数据
        //定义一个list集合存放日期对象
        List<LocalDate> dateList = new ArrayList<>();
        //将开始时间存放到集合中
        dateList.add(begin);

        //开始时间不等于结束时间，循环会一直执行，构造出时间区间
        while (!begin.equals(end)) {
            //将开始日期的日期加1，
            begin = begin.plusDays(1);
            //将更新后的数据存放到集合，完成日期增加
            dateList.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("status", Orders.COMPLETED);
            map.put("begin", beginTime);
            map.put("end", endTime);

            Double turnover = orderMapper.sumByMap(map);

            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);


        }
        return TurnoverReportVO.builder().dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }


    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Integer> newUserList = new ArrayList<>(); //新增用户数
        List<Integer> totalUserList = new ArrayList<>(); //总用户数

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = getUserCount(beginTime, endTime);
            //总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = getUserCount(null, endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        //每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        //每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 查询指定时间区间内的销量排名top10
     * @param begin
     * @param end
     * @return
     * */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end){
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()),",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 根据时间区间统计指定状态的订单数量
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {

        Map map = new HashMap();
        map.put("status", status);
        map.put("begin",beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }

    /**
     * 根据时间区间统计用户数量
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 导出运营数据Excel报表
     */
    public void exportXlsx(HttpServletResponse response) {
        LocalDate beginDate = LocalDate.now().minusDays(30);
        LocalDate endDate = LocalDate.now().minusDays(1);

        //查询数据库，准备数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(beginDate, LocalTime.MIN), LocalDateTime.of(endDate, LocalTime.MAX));

        //通过poi操作Excel
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");//从类路径下加载文件，返回文件的输入流
        try {
            //从已有Excel文件加载
            XSSFWorkbook excel = new XSSFWorkbook(in);

            XSSFSheet sheet = excel.getSheetAt(0);
            XSSFRow row = sheet.getRow(1);
            XSSFCell cell = row.getCell(1);

            cell.setCellValue(beginDate + "至" + endDate);

            //填充概览数据
            row = sheet.getRow(3);
            cell = row.getCell(2);
            cell.setCellValue(businessData.getTurnover());

            cell = row.getCell(4);
            cell.setCellValue(businessData.getOrderCompletionRate());

            cell = row.getCell(6);
            cell.setCellValue(businessData.getNewUsers());

            row = sheet.getRow(4);
            cell = row.getCell(2);
            cell.setCellValue(businessData.getValidOrderCount());

            cell = row.getCell(4);
            cell.setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                row = sheet.getRow(i + 7);
                LocalDate date = beginDate.plusDays(i);
                row.getCell(1).setCellValue(date.toString());

                BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }

            //通过输出流将Excel文件下载到浏览器---输出流
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            out.flush();
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
